When Nixon resigned, Agnew didn’t step up. I was young and wasn’t paying much attention then so I remember exactly how Ford got in.
Agnew resigned before Nixon. I don’t expect Kamala to resign
Agnew was confronted with evidence that he had accepted bribes while VP. He resigned. This was before Watergate. Anyway, Nixon appointed Ford, although democrats floated the idea of not confirming Ford and thus having the democrat Speaker of the House be next in line and giving the dems the Presidency after losing a very one-sided election. So much for ‘our democracy’.